Rolling metal strip



May 10, 1932. A. P. STECKEL ROLLING METAL STRIP Filed June 15. 1927INVENTOR m... 9. mm m.

Patented Ma 10', 1932 UNITED STATES PATENT OFFICE ABBAM P. STECKEL, OFYOUNGSTOWN, OHIO, ASSIGNOR TO THE COLD METAL PROCESS COMPANY, OF-YOUNGSTOWN, OHIO, A CORPORATION OF OHIO nonnnve METAL srmr Applicationfiled June 15,

This invention relates to the rolling of metal strip and particularly tothe'hot rolling thereof. Theterm strip is herein employed to define anextended length of metal in'sheet form regardless of its width.

Metal strip is now being rolled in continuous mills, but these mills areso large and occupy so much space that a very heavy capital outlay isrequired. The operating cost of the continuous mill is high because ofthe large amount of power required.

An older method of making strip material is to employ a single reversingstand and to run the metal out on a roll table to either side of thestand. This method is undesirable because as the metal is reduced to thethinner gauges it rapidly loses heat.

I provide for subjecting a piece of heated metal to a plurality of rollpasses and coiling the metal between passes. This reduces the radiatingsurface to a minimum and permits of rolling for long periods of timewithout reheating; It also makes it possible to materially reduce thecost of the installation since the long run-out tables are unnecessary.It will be understood that roll tables may be employed for efiectingsome of the preliminary reductions, but these will not need to be ofanything like the length which' would be required for the final product.I may place the coilers .in heat conserving chambers, one' on eitherside of the mill. These chambers may be arranged so as to be movedsidewise and thus permit of rolling a slab in the ordinary way down tosuch thicknose that it can be coiled.

Another advantage of the coilers lies in the fact that they areefiective for scaling the metal. I arrange the coilers so that the metalis curled first in one direction and then in the other, so that thescale is cleaned from both sides.

The accompanying figure of drawing illustrates my inventiondiagrammatically. It shows a reversing mill comprising a pair of workingrolls. 2a, each provided with backing up rolls 3a. Either the workingrolls or the backing up rolls may be driven, as desired. The mill isprovided with the usual screw- 1927. Serial No. 198,915.,

downs so that successive reductions maybe made.

Coilers 4a are provided on either side of the mill, these being arrangedto reel or to pay out material depending on which way the mill isrunning. Each coiler is motor driven and may be operated at such a rateas to maintain thedelivered strip under tension.

In operation a heated slab will be rolled in the ordinary way until itis thin enough to coil. The coiled material is supplied to the mill andfed from one reel through the mill and thence to the other reel. 0n thenext succeefing pass the operation will be reversed, the paid outmaterial being fed back through the mill to the first coiler. The heatloss will be very slight as compared with ordinary rolling'practice dueto the very small radiating surface presented by the coil and also dueto the conservation of heat by the chamber 5a. a

It will be noted that the material is flexed first in one direction andthen in the other. slghis efiects removal of the scale from the rip.While I have illustrated a preferred embodiment of my invention, it willbe understood that the invention is notthus limited, as it may beotherwise practiced or embodied within the scope of the following claimsI claim v 1. The method of rolling metal strip whichincludes coiling astrip of hot metal in a heating chamber, uncoiling the same and feeding1t from the chamber through a roll. pass and to another heated chamber,coiling the strip therein in a direction opposite to heating chamber,the same andv W feeding it from the chamber through a roll pass and toanother heated chamber, coiling the strip therein in a directionopposite to that in which it was first coiled, periodically reversingthe direction of rolling, and maintaining the metal under tensionbetween the rolling thereof and the coiling thereof.

3. The method of rolling strip metal which includes coiling a strip ofhot metal in a heating chamber, uncoiling the same and feeding it fromthe. chamber through a roll pass and to another heated chamber, coilingthe strip therein, periodically reversing the direction of rolling sothat the material is fed back and forth from one coil to another,

and subjecting the material to bending in both directions so as toeffect removal of scale.

In testimony whereof I havehereunto set my hand.

ABRAM P. STECKEL.

